>> The new outlook have SMTP problems every time, and can only store 3 months of emails.
Who is your mail host? What type of account is it (POP/IMAP)? I'm using Outlook (new) with Exchange mailbox hosted on 365 cloud (no SMTP, POP/IMAP). I can see everything in my mailbox.
Outlook (new) isn't that bad. It's just an UNFINISHED product and may be full of bugs. It is wrong to release/force users to use it. They should pay beta testers to use the unfinished product. I guess this is the new way of releasing new software... the users are the beta testers (copying CrowdStrike's policy).